Nitrite in the root zone increases the peroxidase activity of wheat roots at pH 4.0

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Nitrate is the principal source of nitrogen in soil, but nitrite may also accumulate in the root zone under environmental stress conditions. Nitrite ion is an additional potential N source for wheat plants, but it proved to be a stress factor below pH 4.5. 1 mM nitrite nutrition reduced the elongation and dry matter accumulation of wheat roots at pH 4.0 as compared with those of plants growing in a culture solution containing 1 mM nitrate, but did not inhibit these parameters at pH 7.0. The activities of soluble and cell wall-bound peroxidase fractions of roots with guaiacol as substrate were increased significantly in all culture media at pH 4.0 as compared with those of plants growing at pH 7.0, but the effect of nitrite was much greater in the peroxidase fractions bound ionically or covalently to the cell wall. The changes in peroxidase activities coincide well with the significant inhibition of root elongation by nitrite nutrition at pH 4.0. The cell wall-bound isoenzymes of peroxidases may regulate the elongation growth of roots by decreasing the plasticity of the cell walls.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalCereal Research Communications
Volume25
Issue number2
Publication statusPublished - 1997

Fingerprint

Nitrites
nitrites
rhizosphere
peroxidase
Cell Wall
wheat
cell walls
Peroxidase
Nitrates
Triticum
root growth
nitrates
nutrition
Guaiacol
Peroxidases
guaiacol
peroxidases
dry matter accumulation
Isoenzymes
Culture Media

Keywords

  • Acidic pH
  • Environmental pollution
  • Nitrite ion
  • Peroxidase fractions
  • Root growth
  • Wheat seedlings

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Nitrite in the root zone increases the peroxidase activity of wheat roots at pH 4.0. / Tari, I.

In: Cereal Research Communications, Vol. 25, No. 2, 1997, p. 197-202.

Research output: Contribution to journalArticle

@article{528dda1f292f46608dd5bfc2db6d11af,
title = "Nitrite in the root zone increases the peroxidase activity of wheat roots at pH 4.0",
abstract = "Nitrate is the principal source of nitrogen in soil, but nitrite may also accumulate in the root zone under environmental stress conditions. Nitrite ion is an additional potential N source for wheat plants, but it proved to be a stress factor below pH 4.5. 1 mM nitrite nutrition reduced the elongation and dry matter accumulation of wheat roots at pH 4.0 as compared with those of plants growing in a culture solution containing 1 mM nitrate, but did not inhibit these parameters at pH 7.0. The activities of soluble and cell wall-bound peroxidase fractions of roots with guaiacol as substrate were increased significantly in all culture media at pH 4.0 as compared with those of plants growing at pH 7.0, but the effect of nitrite was much greater in the peroxidase fractions bound ionically or covalently to the cell wall. The changes in peroxidase activities coincide well with the significant inhibition of root elongation by nitrite nutrition at pH 4.0. The cell wall-bound isoenzymes of peroxidases may regulate the elongation growth of roots by decreasing the plasticity of the cell walls.",
keywords = "Acidic pH, Environmental pollution, Nitrite ion, Peroxidase fractions, Root growth, Wheat seedlings",
author = "I. Tari",
year = "1997",
language = "English",
volume = "25",
pages = "197--202",
journal = "Cereal Research Communications",
issn = "0133-3720",
publisher = "Cereal Research Non-Profit Company",
number = "2",

}

TY - JOUR

T1 - Nitrite in the root zone increases the peroxidase activity of wheat roots at pH 4.0

AU - Tari, I.

PY - 1997

Y1 - 1997

N2 - Nitrate is the principal source of nitrogen in soil, but nitrite may also accumulate in the root zone under environmental stress conditions. Nitrite ion is an additional potential N source for wheat plants, but it proved to be a stress factor below pH 4.5. 1 mM nitrite nutrition reduced the elongation and dry matter accumulation of wheat roots at pH 4.0 as compared with those of plants growing in a culture solution containing 1 mM nitrate, but did not inhibit these parameters at pH 7.0. The activities of soluble and cell wall-bound peroxidase fractions of roots with guaiacol as substrate were increased significantly in all culture media at pH 4.0 as compared with those of plants growing at pH 7.0, but the effect of nitrite was much greater in the peroxidase fractions bound ionically or covalently to the cell wall. The changes in peroxidase activities coincide well with the significant inhibition of root elongation by nitrite nutrition at pH 4.0. The cell wall-bound isoenzymes of peroxidases may regulate the elongation growth of roots by decreasing the plasticity of the cell walls.

AB - Nitrate is the principal source of nitrogen in soil, but nitrite may also accumulate in the root zone under environmental stress conditions. Nitrite ion is an additional potential N source for wheat plants, but it proved to be a stress factor below pH 4.5. 1 mM nitrite nutrition reduced the elongation and dry matter accumulation of wheat roots at pH 4.0 as compared with those of plants growing in a culture solution containing 1 mM nitrate, but did not inhibit these parameters at pH 7.0. The activities of soluble and cell wall-bound peroxidase fractions of roots with guaiacol as substrate were increased significantly in all culture media at pH 4.0 as compared with those of plants growing at pH 7.0, but the effect of nitrite was much greater in the peroxidase fractions bound ionically or covalently to the cell wall. The changes in peroxidase activities coincide well with the significant inhibition of root elongation by nitrite nutrition at pH 4.0. The cell wall-bound isoenzymes of peroxidases may regulate the elongation growth of roots by decreasing the plasticity of the cell walls.

KW - Acidic pH

KW - Environmental pollution

KW - Nitrite ion

KW - Peroxidase fractions

KW - Root growth

KW - Wheat seedlings

UR - http://www.scopus.com/inward/record.url?scp=0030767902&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030767902&partnerID=8YFLogxK

M3 - Article

VL - 25

SP - 197

EP - 202

JO - Cereal Research Communications

JF - Cereal Research Communications

SN - 0133-3720

IS - 2

ER -